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Matematika 4B - Katedra matematiky FEL ČVUT

Matematika 4B - Katedra matematiky FEL ČVUT

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Závěr:<br />

g(y) = f(h−1 (y))<br />

|h ′ (h −1 (y))| .<br />

pro y ∈ J a nula jinak.<br />

6.7. Příklad. Logaritmicko-normální rozdělení<br />

Y = e X ,<br />

kde X má rozdělení N(µ, σ 2 ).<br />

h(x) = e x , h −1 (x) = ln x , J = h(R) = (0, ∞) .<br />

g(y) =<br />

pro y > 0; a nula jinak.<br />

f(ln y) 1 (ln y−µ)2<br />

−<br />

= √ e 2σ<br />

eln y<br />

2πσ 2<br />

1<br />

y ,<br />

110

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